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Abstract

Development of A Mechanistic Model for Predicting Flow-Induced Bottom Line Corrosion (BLC)

Author(s): MP Mothiba

resently, one of the insurmountable topics in corrosion research is to gain an insight into in-situ denigration mechanism on a scale concealed corroding surface. To access this knowledge, a Helmholtz concept of flow-induced bottom line corrosion (BLC) in mild steel pipeline, was studied by installing a Bio-Logic ASA Potentiostat Electrochemical analyzer to a horizontal duct. With metal mine effluents (MME) and synthetic seawater (SSW) solution, respectively, streaming over the test specimen for 24-and 192-hours. Thus, this mechanistic approach takes into account the electrochemical kinetics, hydrodynamic pressure and velocity, charge-mass transfer parameters and pit perforation. The concurrence between the model results (i.e. hydrodynamic parameters and velocity potential) and the experimental data (i.e. potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)) are satisfactory. The internal corrosion rate behaviour which is inclusive to scale abrasions and impingement were explained by an (a) factor, constant phase element, polarization resistance, corrosion potential and corrosion current density
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